PIPE END FITTING WITH IMPROVED VENTING

Abstract

A pipe end fitting assembly that includes an outer body having an outer surface, an inner surface defining a first bore, and an end surface, and an inner body having an inner surface defining a second bore and an outer surface. A portion of the inner body outer surface is secured to the outer body inner surface. A passage formed in the outer body includes a first portion extending from the end surface and parallel to the first bore, and a second portion extending from the outer body outer surface to the passage first portion. A pipe end is disposed around and secured to a portion of the inner body outer surface. A jacket is disposed around the pipe and has an end secured to the outer body outer surface. The passage portions are in fluid communication with each other and a space between the jacket and the pipe.

Claims

1. A pipe end fitting assembly, comprising: an outer body having an outer surface, an inner surface defining a first bore, and an end surface extending between the inner and outer surfaces; an inner body having an inner surface defining a second bore and an outer surface, wherein a first portion of the inner body outer surface is secured to the outer body inner surface; a jacket disposed around the inner body and having an end secured to the outer body outer surface; and a passage formed in the outer body extending from the end surface to the outer surface of the outer body, wherein the passage includes a first portion extending from the end surface and a second portion extending from the outer surface of the outer body to the first portion of the passage, the first and second portions of the passage are in fluid communication with each other and with a space extending between the jacket and the inner body, and the first portion of the passage does not extend completely through the outer body.

2. The assembly of claim 1, comprising an annular notch formed into the outer surface of the outer body, wherein the first portion of the passage does not extend beyond the annular notch.

3. The assembly of claim 1, wherein the passage only comprises two openings, namely a first opening for the first portion of the passage and a second opening for the second portion of the passage.

4. The assembly of claim 1, wherein the passage comprises an unencumbered passage without any obstructions to a flow of fluid through the passage.

5. The assembly of claim 1, wherein the first portion of the passage is parallel to the first bore.

6. The assembly of claim 1, wherein and no part of the first portion of the inner body extends beyond the outer body.

7. A pipe end fitting assembly, comprising: an outer body having an outer surface, an inner surface defining a first bore, and an end surface extending between the inner and outer surfaces; an inner body having an inner surface defining a second bore and an outer surface, wherein a first portion of the inner body outer surface is secured to the outer body inner surface, and no part of the first portion extends beyond the outer body; a jacket disposed around the inner body and having an end secured to the outer body outer surface; and a passage formed in the outer body extending from the end surface to the outer surface of the outer body, wherein the passage includes a first portion extending from the end surface and a second portion extending from the outer surface of the outer body to the first portion of the passage, and wherein the first and second portions of the passage are in fluid communication with each other and with a space extending between the jacket and the inner body.

8. The assembly of claim 7, wherein the inner body is only secured to the outer body inner surface and in contact with the space extending between the jacket and the inner body.

9. The assembly of claim 7, wherein the outer body comprises a securing end for securing the pipe end fitting assembly to its destination.

10. The assembly of claim 9, wherein the inner body does not comprise the securing end.

11. The assembly of claim 7, comprising a metallic weld securing the end surface to the inner body outer surface.

12. The assembly of claim 7, wherein the first portion of the inner body outer surface terminates at a first end, and the assembly further comprises a weld securing the first end to the outer body inner surface.

13. The assembly of claim 7, wherein a second portion of the inner body outer surface includes serrations formed therein.

14. The assembly of claim 7, wherein the first portion of the passage does not extend completely through the outer body.

15. The assembly of claim 7, comprising an annular notch formed into the outer surface of the outer body.

16. A pipe end fitting assembly, comprising: an outer body having an outer surface, an inner surface defining a first bore, and an end surface extending between the inner and outer surfaces; an inner body having an inner surface defining a second bore and an outer surface, wherein a first portion of the inner body outer surface is secured to the outer body inner surface; a jacket disposed around the inner body and having an end secured to the outer body outer surface; and a passage formed in the outer body extending from the end surface to the outer surface of the outer body, wherein the passage includes a first portion extending from the end surface and a second portion extending from the outer surface of the outer body to the first portion of the passage, the first and second portions of the passage are in fluid communication with each other and with a space extending between the jacket and the inner body, and an annular notch is formed into the outer surface of the outer body.

17. The assembly of claim 16, wherein the annular notch is formed into the outer surface of the outer body beyond the opening of the second portion in a direction away from the end surface.

18. The assembly of claim 16, wherein the annular notch is formed on the outer surface of the outer body near a securing end for securing the pipe end fitting assembly to its destination.

19. The assembly of claim 16, wherein the first portion of the passage does not extend completely through the outer body.

20. The assembly of claim 16, wherein and no part of the first portion of the inner body extends beyond the outer body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a side cross sectional view of a conventional pipe end fitting.

[0011] FIG. 2 is a side cross sectional view of the pipe end fitting assembly of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention is pipe end fitting assembly 30, which is illustrated in FIG. 2. The pipe end fitting assembly 30 constitutes two separate components that are affixed to each other: the outer body 32 and the inner body 34.

[0013] The outer body 32 is generally cylindrically shaped having an inner surface 32a that defines a bore 36 extending longitudinally through the outer body. A connector notch 38 is formed on the outer surface 32b of outer body 32 (to facilitate connection to its destination). The inner body 34 is generally cylindrically shaped with an inner surface 34a that defines a bore 40 extending longitudinally through the inner body 34. One end of the inner body 34 has serrations on the outer surface 34b of the inner body 34, forming a serrated pipe connector 42 (for receiving and securing a pipe end). The other end of the inner body 34 is disposed in bore 36 and mounted to the outer body 32. Specifically, the outer surface 34b of inner body 34 is secured to the inner surface 32a of the outer body 32, preferably with a press-fit (i.e. shear force between the inner surface 32a of outer body 32 and the outer surface 34b of inner body 34, creating an interference fit therebetween). The interference fit can optionally be temperature enhanced, where one of the inner/outer bodies is heated and the other is cooled before being fitted together so additional compressive forces are generated after being fitted together as they equalize in temperature. Optional welds 44 can be formed at the edges of the inner/outer bodies 32/34, which constitute a redundant seal to contain pressurized liquids/gasses. Serrations or threads could additionally or alternatively be used to secure the outer and inner bodies 32/34 together for enhanced tensile capacity.

[0014] A pipe assembly 46 connects to the pipe end fitting 30. Pipe assembly 46 includes an inner pipe 48 and a jacket 50 surrounding the inner pipe 48. The end of the inner pipe 48 slides over and engages the serrated pipe connector 42. The end of the jacket 50 is secured to the outer body 32 by a weld 52. Any liquids or gasses that leak out of pipe 48 and into the space 53 between pipe 48 and jacket 50 are captured by jacket 50 and guided to the end fitting assembly 30.

[0015] A vent passage 54 is formed through the outer body 32, providing venting for space 53. Preferably, passage 54 includes a first passage portion 54a extending longitudinally within the outer body 32 (parallel to bore 36), and a second passage portion 54b extending outwardly from the first passage portion 54a to the outer surface 32b of outer body 32 (i.e. first and second passage portions 54a/54b are orthogonal to each other). The formation of the first passage portion 54a was not feasible in the conventional design of FIG. 1 because the excessive length of the serrated pipe connector 14 blocked access to the surface in which such a passage could be made (i.e. most drilling or material removing machinery requires full access to the surface in which drilling or material removal is to be performed). However, with the design of FIG. 2, first passage portion 54a can be reliably made in outer body 32 before it is mounted to inner body 34, where end surface 56 of outer body 32 (into which first passage portion 54a is formed) is fully accessible. Likewise, second passage portion 54b is machined into the outer surface 32b of outer body 32 (which is fully accessible as well) until the two passage portions 54a/54b meet. Passage 54 provides fluid communication between space 53 and the outer surface 32b of outer body 32, where leaked liquids or gasses in space 53 can be vented and captured. The multi-portion passage 54 is far more reliable than the conventional technique of forming the vent port in the jacket itself, where unintended deformation and leaking can occur.

[0016] Another advantage of the forming end fitting assembly 30 using two separate bodies 32/24 attached together is the optimization/minimization of material stock used to make end fitting assembly 30. Smaller dimensioned stock material can be used to individually form the inner and outer bodies 32/24, which significantly lowers the amount of stock material that is wasted compared to machining the end fitting as a single piece of material. The machining processes for fabricating the inner and outer bodies 32/34 is simplified, making them faster and less expensive to make compared to the single piece end 10 fitting of FIG. 1.

[0017] It is to be understood that the present invention is not limited to the embodiment(s) described above and illustrated herein, but encompasses any and all variations falling within the scope of the appended claims. For example, references to the present invention herein are not intended to limit the scope of any claim or claim term, but instead merely make reference to one or more features that may be covered by one or more of the claims. Materials, processes and numerical examples described above are exemplary only, and should not be deemed to limit the claims. Further, as is apparent from the claims and specification, not all method steps need be performed in the exact order illustrated or claimed, but rather in any order that allows the proper formation of the pipe end fitting of the present invention.